BIOL 1000 Chapter Notes - Chapter 2: Cell Membrane, Chromosome Segregation, Plants And Animals
2 Jan 2014
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Bacteria, archaea, some protists(amoebas), some fungi(yeast) = unicellular(each. Plants & animals = complex multicellular(if cells broken= cant reproduce, grow) All forms of life grouped into 3 domains = bacteria, the archaea, the eukarya. All organisms are composed of one or more cells. The cell is the basic structure and functional unit of all living organisms. Cells arise only from the division of pre-existing cells. Cell theory(notion of common descent) ex: kids from fertilized egg(common descent = egg) cell functionally independent organisms) bacteria & archaea originally grouped into single domain: prokaryota(prokaryotes) Plasma membrane: bilayer made of lipids with embedded protein molecules(cells bounded by this). Function = separate/protect content of cell from external environment. Phospholipid bilayer: hydrophobic(non-polar/can"t mix with water) barrier to the passage of water-soluble substances. But selected water-soluble substances can penetrate cell membrane through transport protein channels. Arrangement = phospholipids two molec thick enviro that code for individual proteins. tails.
